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How many times must a man toss a fair coin, so that the probability of having at least one head is more than 80%.

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How many times must a man toss a fair coin, so that the probability of having at least one head is more than 80%.

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Let the coin be tossed  n times 

:. p(getting at least one head) > 80/100

The minimum value of n satisfying the eqn. is 3.

n = 3(i.e. 3 times)

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